US9569444B1 - Selective operation pushdowns from an analytics platform to bulk storage - Google Patents
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- US9569444B1 US9569444B1 US14/968,057 US201514968057A US9569444B1 US 9569444 B1 US9569444 B1 US 9569444B1 US 201514968057 A US201514968057 A US 201514968057A US 9569444 B1 US9569444 B1 US 9569444B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/55—Push-based network services
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/24—Querying
- G06F16/245—Query processing
- G06F16/2458—Special types of queries, e.g. statistical queries, fuzzy queries or distributed queries
- G06F16/2465—Query processing support for facilitating data mining operations in structured databases
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- G06F17/30079—
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/25—Integrating or interfacing systems involving database management systems
- G06F16/254—Extract, transform and load [ETL] procedures, e.g. ETL data flows in data warehouses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
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- H04L67/26—
Definitions
- Embodiments of the present invention relate to operation pushdowns and, more specifically, to selective operation pushdowns from an analytics platform to bulk storage.
- Analytics platforms or clusters such as ApacheTM SparkTM, Apache Hadoop®, and others, are dedicated hardware or software environments for performing analysis on large amounts of data.
- big data which refers to large sets of unstructured or semi-structured data
- an analytics platform ingests data and processes it locally.
- the bulk of the data is not permanently stored on the analytics platform. Rather, the data is stored in bulk storage, such as OpenStack® Swift, Amazon® Simple Storage Service (S3), or CephTM or on a file system or database. Thus, data is migrated onto the analytics platform for analysis.
- a SELECT operation which selects specific fields from the data, may be pushed down to the bulk storage, such that only the specific fields desired are migrated to the analytics platform.
- the analytics platform can then perform any further processing on the migrated data, which excludes unneeded fields.
- the amount of data migrated can be reduced, as compared to migrating all the fields of the data.
- FILTER operation which identifies objects that meet certain criteria in the data, it may be more efficient to perform this operation at the bulk storage, thus delivering to the analytics platform only the records that meet the filtering criteria.
- a computer-implemented method for determining whether to perform a pushdown includes receiving a request for analytics to be performed by an analytics platform on data stored in bulk storage.
- An operation is identified as a candidate for a pushdown, where the operation is selected from among one or more operations to be performed for fulfilling the request.
- the pushdown would require the operation to be performed at the bulk storage.
- the data is sampled by reading one or more samples of the data, where the one or more samples are a fraction of the data.
- the operation is performed, by a computer processor, on the one or more samples. It is determined, based on performing the operation on the one or more samples, whether to perform the pushdown of the operation.
- a system for determining whether to perform a pushdown includes a memory having computer readable instructions and one or more processors for executing the computer readable instructions.
- the computer readable instructions include receiving a request for analytics to be performed by an analytics platform on data stored in bulk storage. Further according to the computer readable instructions, an operation is identified as a candidate for a pushdown, where the operation is selected from among one or more operations to be performed for fulfilling the request. The pushdown would require the operation to be performed at the bulk storage.
- the data is sampled by reading one or more samples of the data, where the one or more samples are a fraction of the data.
- the operation is performed on the one or more samples. It is determined, based on performing the operation on the one or more samples, whether to perform the pushdown of the operation.
- a computer program product for determining whether to perform a pushdown includes a computer readable storage medium having program instructions embodied therewith.
- the program instructions are executable by a processor to cause the processor to perform a method.
- the method includes receiving a request for analytics to be performed by an analytics platform on data stored in bulk storage. Further according to the method, an operation is identified as a candidate for a pushdown, where the operation is selected from among one or more operations to be performed for fulfilling the request.
- the pushdown would require the operation to be performed at the bulk storage.
- the data is sampled by reading one or more samples of the data, where the one or more samples are a fraction of the data.
- the operation is performed on the one or more samples. It is determined, based on performing the operation on the one or more samples, whether to perform the pushdown of the operation.
- FIG. 1 is a block diagram of a sampling system, according to some embodiments of this disclosure.
- FIG. 2 is a flow diagram of a method for sampling data in bulk storage to determine whether to perform an operation pushdown, according to some embodiments of this disclosure
- FIG. 3 is a flow diagram of a method for sampling data in bulk storage to determine whether to perform compression while determining whether to perform an operation pushdown, according to some embodiments of this disclosure.
- FIG. 4 is a block diagram of a computer system for implementing some or all aspects of the sampling system, according to some embodiments of this disclosure.
- operation pushdowns can improve efficiency in terms of the actual migration, they have the potential to slow down analytics processing as a whole rather than speed it up. For instance, suppose analysis of a set of objects is desired, but only the objects representing people with a certain area code are relevant. In this case, conventionally, a pushdown of a FILTER operation may be performed to first identify which of the objects have phone numbers with the area code. Then only those objects would be migrated to the analytics platform.
- the objects being examined may all have the specified area code.
- each object in the data is examined to determine whether it has the area code, but not a single one of such objects ends up being filtered out.
- this time spent to perform the pushdown was wasted, in that it used processing power, memory, and time, without saving bandwidth during the migration.
- sampling systems configured to sample data on bulk storage to determine whether an operation pushdown should be performed. Such a sampling system may avoid the problem of performing work for the pushdown, when that work is estimated to come at a greater cost than the estimated benefit of the pushdown.
- FIG. 1 is a block diagram of a sampling system 100 , according to some embodiments of this disclosure.
- the sampling system 100 may include or involve an analytics platform 110 , bulk storage 120 , and a client device 130 .
- the analytics platform 110 may, for example, Spark, Hadoop, or a database environment using Structured Query Language (SQL), SQLLite, or Not Only SQL (NoSQL).
- the bulk storage 120 may be, for example, Swift, Amazon S3, or Ceph. However, it will be understood that other analytics platforms 110 and bulk storage 120 may be used instead of or in addition to these.
- the bulk storage 120 may store data in the form of one or more objects, each of which may be a record, file, or collection, and each of which may have one or more fields. In some embodiments, these objects are not indexed in the bulk storage 120 , and the objects may be unstructured. In database environments or other indexed environments, filtering is typically efficient, and thus, some embodiments of the sampling system 100 may provide a greater benefit with bulk storage 120 that is not indexed. In contrast, existing filtering and selection mechanisms for unstructured and non-indexed data are typically much less efficient, and thus, those environments may derive a greater benefit from the sampling system 100 described herein. However, it will be understood that the sampling system 100 is not limited non-indexed or unstructured bulk storage 120 .
- the client device 130 may provide an analytics request to the analytics platform 110 , which may in turn communicate with the bulk storage 120 , where the objects to be processed are stored. Sampling may be performed on the objects in the bulk storage 120 to determine whether to perform a pushdown as part of fulfilling the request. Based on the determination, the bulk storage 120 may perform one or more operations as part of responding to the request, and may deliver the resulting data to the analytics platform 110 .
- the analytics platform 110 may finish processing the request and may return results to the client device 130 .
- FIG. 2 is a flow diagram of a method 200 for sampling data in bulk storage to determine whether to perform an operation pushdown, according to some embodiments of this disclosure.
- a request for analytics of data may be received at the analytics platform 110 .
- request may come from the client device 130 .
- the analytics platform 110 may then begin a job for processing the request, where that job may include one or more operations for fulfilling the request.
- an operation of the job may be identified as a candidate for an operation pushdown. For instance, a FILTER operation may be included as part of the job, and this type of operation may automatically be deemed a candidate operation.
- Identification of candidate operations may be performed by various means. For example, and not by way of limitation, the analytics platform 110 may identify as candidate operations those operations of the job that fit certain criteria (e.g., being certain types of operations). For another example, the request from the client device 130 may specify which operations are candidate operations for potential pushdown.
- the sampling system 100 may determine whether sampling would be beneficial for evaluating whether to perform a pushdown. In some embodiments, this determination may be made by the analytics platform 110 . Certain operations may prompt sampling, while others may not. For instance, in some embodiments, in the case of a SELECT operation, the sampling may be skipped as it may be determined without sampling whether to perform the pushdown. A SELECT operation selects specific fields from all objects in the data, and thus, there is likely to be a significant reduction in the data being migrated. As a result, the sampling discussed below may be skipped for a SELECT operation, and a pushdown may be performed. Thus, if sampling is deemed not to be beneficial at decision block 230 , then a pushdown may be performed at block 270 .
- the resource reduction potential of performing a pushdown on the operation may be evaluated through sampling.
- This evaluation may be performed, for example, at the analytics platform 110 or at the bulk storage 120 .
- the analytics platform 110 may read samples across a communication channel between the analytics platform 110 and the bulk storage 120 , and may perform the evaluation at the analytics platform 110 .
- the analytics platform 110 may notify the bulk storage 120 of the candidate operation, and the bulk storage 120 may perform the sampling and evaluation to determine whether to perform the candidate operation before migrating data to the analytics platform 110 .
- samples are read from the data in bulk storage 120 .
- the samples may be only a fraction of the data, excluding some other portion of the data.
- the fraction used as samples may be a proper subset of the objects in the data, excluding some other objects in the data.
- the samples may be selected randomly as, in some instances, the data may be sorted in the bulk storage 120 . For example, and not by way of limitation, if the data being sampled is a single object in the form of a log, fifty random lines may be read from the log as samples. For another example, if the data being sampled includes multiple objects in the form of records, a subset of those records may be read as samples.
- the number of samples read may be based on various factors, such as the total size of the data. However, in some embodiments, standard statistical guarantees may be used to determine an appropriate sample size.
- the sampling system 100 may estimate a resource reduction, or cost savings, which may describe the reduction in resources required to migrate only the results of the operation, versus migrating all the data if no pushdown is performed. To this end, the sampling system 100 may perform the candidate operation on the samples.
- the resource reduction may be, for example, in terms of bandwidth or time. For instance, in the case of a FILTER operation, the analytics platform 110 may determine what percent of the samples would be filtered out. It may then be assumed that the same percentage would be filtered out of the entire set of data.
- the sampling system 100 may determine how much bandwidth would be saved in migrating the data to the analytics platform 110 with a pushdown versus without one, or the sampling system 100 may determine how much time would be saved in migrating only the data remaining after the filtering, versus migrating the entire set of data.
- the sampling system 100 may determine whether to perform a pushdown of the candidate operation. Thus determination may be made in various ways. In some embodiments, for instance, a threshold size may be established, such that the pushdown is performed only if the migration traffic would be reduced by an amount of data that is at least the threshold size. For instance, with a FILTER operation, the pushdown may be performed if the amount or percentage of data estimated to be filtered out of the entire data set meets the threshold.
- the threshold may be a function of the environment. For instance, the threshold may be based on the processing power of the bulk storage 120 , the bandwidth between the analytics platform 110 and the bulk storage 120 , or both. Less bandwidth between the analytics platform 110 and the bulk storage 120 correlates to more benefit in every byte of data reduced for the migration. However, if the bulk storage 120 would be much less efficient at performing the operation than the analytics platform 110 would be, then a greater resource reduction may be needed to outweigh this inefficiency. Further, in some embodiments, the threshold may change dynamically as the environment (e.g., the bandwidth, the efficiency of the bulk storage 120 ) changes.
- the sampling system 100 may estimate a cost of performing the pushdown and may compare this cost to the resource reduction.
- the cost may be in terms of processing power, memory consumption, time, some other factor, or a combination thereof. This cost may be calculated based on the performance of the candidate operation on the samples. As a result of performing the operation, the sampling system 100 may thus observe the cost of performing the operation on the samples. With knowledge of how the size of the sample compares to the entire size of the data, the sampling system 100 may thus estimate the cost of performing the operation on the entire set of data.
- this comparison may be straight forward and may involve determining whether the value of the resource reduction is greater than the value of the cost. In some embodiments, however, the sampling system 100 may have an established formula for comparing the two.
- the bulk storage 120 may perform the operation, in performance of the pushdown.
- the results of the operation may be migrated to the analytics platform 110 .
- the entire set of data may be migrated to the analytics platform 110 , where the operation may be performed.
- additional processing to complete the job and fulfill the request may be performed, and at block 295 , the analytics platform 110 may respond to the request with the results of the job.
- the request may require a combination of operations, some of which may be candidate operations for potential pushdown.
- a combination of operations some of which may be candidate operations for potential pushdown.
- the sampling system 100 may perform blocks 230 through 280 for the candidate operation. The result may be that a sequence of operations are pushed down to the bulk storage 120 .
- the sampling system 100 may consider two or more operations together during sampling. In that case, various combinations of the operations may be performed on the samples to determine whether to perform any pushdowns and, if so, which combination of operations are pushed down and performed by the bulk storage 120 .
- compression may be used to further reduce the bandwidth being spent when migrating data from the bulk storage 120 to the analytics platform 110 .
- FIG. 3 is a flow diagram of a method 300 for sampling data in bulk storage to determine whether to perform compression while determining whether to perform an operation pushdown, according to some embodiments of this disclosure. Many of the operations in this method 300 are similar to those of the method 200 above, and those operations are merely summarized in the below description.
- a request for analytics on a set of data may be received at the analytics platform 110 .
- the analytics platform 110 may then begin a job for processing the request.
- an operation of the job may be identified as a candidate for an operation pushdown.
- it may be determined whether sampling would be beneficial for evaluating whether a pushdown should be performed. If sampling would not be beneficial, then a pushdown may be performed at block 345 .
- samples may be read from the data in bulk storage 120 .
- compression may be performed on the samples. In some embodiments, this compression is performed by the same component that applies the candidate operation to the samples. Because the reduction in data size varies across compression techniques and varies based on the specific data being compressed, the benefit of each compression technique might not be known prior to the sampling.
- the sampling system 100 may estimate the size reduction of each compression technique if applied to the entire set of data. The sampling system 100 may also observe the time to perform the compression techniques, and may thus estimate the time to compress all the data to be migrated. Based on these estimates, at decision block 330 , the sampling system 100 may determine whether to perform a compression technique on the data to be migrated.
- the sampling system 100 may select the compression technique with the best results on the samples (i.e., the greatest size reduction), and may determine whether that size reduction outweighs the cost of performing the compression. If so, then the sampling system 100 may decide that the selected compression technique should be performed.
- the sampling system 100 may estimate a resource reduction of performing the pushdown, based on the samples read.
- it may be determined, based on the resource reduction, whether to perform the pushdown. If it is decided that the pushdown should be performed, then at block 345 a pushdown may be performed on the candidate operation. In other words, in this case, the bulk storage 120 may perform the operation. Further, if it was determined that a compression technique should be applied, then the data to be migrated may be compressed based on that compression technique after the candidate operation is performed.
- the data resulting after the pushdown and the optional compression may be migrated to the analytics platform 110 .
- the operation pushdown may be skipped at block 355 .
- the entire data set may be compressed based on that compression technique.
- the entire set of data, with or without compression may be migrated to the analytics platform 110 , where the candidate operation may be performed.
- additional processing to complete the job may be performed, and at block 370 , the analytics platform 110 may respond to the request with the results of the job.
- FIG. 4 illustrates a block diagram of a computer system 400 for use in implementing a sampling system 100 or method according to some embodiments.
- the sampling systems 100 and methods described herein may be implemented in hardware, software (e.g., firmware), or a combination thereof.
- the methods described may be implemented, at least in part, in hardware and may be part of the microprocessor of a special or general-purpose computer system 400 , such as a personal computer, workstation, minicomputer, or mainframe computer.
- the analytics platform 110 and the bulk storage 120 may each run on one or more computer systems 400 .
- the computer system 400 includes a processor 405 , memory 410 coupled to a memory controller 415 , and one or more input devices 445 and/or output devices 440 , such as peripherals, that are communicatively coupled via a local I/O controller 435 .
- These devices 440 and 445 may include, for example, a printer, a scanner, a microphone, and the like.
- Input devices such as a conventional keyboard 450 and mouse 455 may be coupled to the I/O controller 435 .
- the I/O controller 435 may be, for example, one or more buses or other wired or wireless connections, as are known in the art.
- the I/O controller 435 may have additional elements, which are omitted for simplicity, such as controllers, buffers (caches), drivers, repeaters, and receivers, to enable communications.
- the I/O devices 440 , 445 may further include devices that communicate both inputs and outputs, for instance disk and tape storage, a network interface card (MC) or modulator/demodulator (for accessing other files, devices, systems, or a network), a radio frequency (RF) or other transceiver, a telephonic interface, a bridge, a router, and the like.
- MC network interface card
- modulator/demodulator for accessing other files, devices, systems, or a network
- RF radio frequency
- the processor 405 is a hardware device for executing hardware instructions or software, particularly those stored in memory 410 .
- the processor 405 may be a custom made or commercially available processor, a central processing unit (CPU), an auxiliary processor among several processors associated with the computer system 400 , a semiconductor based microprocessor (in the form of a microchip or chip set), a macroprocessor, or other device for executing instructions.
- the processor 405 includes a cache 470 , which may include, but is not limited to, an instruction cache to speed up executable instruction fetch, a data cache to speed up data fetch and store, and a translation lookaside buffer (TLB) used to speed up virtual-to-physical address translation for both executable instructions and data.
- the cache 470 may be organized as a hierarchy of more cache levels (L1, L2, etc.).
- the memory 410 may include one or combinations of volatile memory elements (e.g., random access memory, RAM, such as DRAM, SRAM, SDRAM, etc.) and nonvolatile memory elements (e.g., ROM, erasable programmable read only memory (EPROM), electronically erasable programmable read only memory (EEPROM), programmable read only memory (PROM), tape, compact disc read only memory (CD-ROM), disk, diskette, cartridge, cassette or the like, etc.).
- volatile memory elements e.g., random access memory, RAM, such as DRAM, SRAM, SDRAM, etc.
- nonvolatile memory elements e.g., ROM, erasable programmable read only memory (EPROM), electronically erasable programmable read only memory (EEPROM), programmable read only memory (PROM), tape, compact disc read only memory (CD-ROM), disk, diskette, cartridge, cassette or the like, etc.
- ROM erasable programmable read only memory
- EEPROM electronically
- the instructions in memory 410 may include one or more separate programs, each of which comprises an ordered listing of executable instructions for implementing logical functions.
- the instructions in the memory 410 include a suitable operating system (OS) 411 .
- the operating system 411 essentially may control the execution of other computer programs and provides scheduling, input-output control, file and data management, memory management, and communication control and related services.
- Additional data including, for example, instructions for the processor 405 or other retrievable information, may be stored in storage 420 , which may be a storage device such as a hard disk drive or solid state drive.
- the stored instructions in memory 410 or in storage 420 may include those enabling the processor to execute one or more aspects of the sampling systems 100 and methods of this disclosure.
- the computer system 400 may further include a display controller 425 coupled to a display 430 .
- the computer system 400 may further include a network interface 460 for coupling to a network 465 .
- the network 465 may be an IP-based network for communication between the computer system 400 and an external server, client and the like via a broadband connection.
- the network 465 transmits and receives data between the computer system 400 and external systems.
- the network 465 may be a managed IP network administered by a service provider.
- the network 465 may be implemented in a wireless fashion, e.g., using wireless protocols and technologies, such as WiFi, WiMax, etc.
- the network 465 may also be a packet-switched network such as a local area network, wide area network, metropolitan area network, the Internet, or other similar type of network environment.
- the network 465 may be a fixed wireless network, a wireless local area network (LAN), a wireless wide area network (WAN) a personal area network (PAN), a virtual private network (VPN), intranet or other suitable network system and may include equipment for receiving and transmitting signals.
- LAN wireless local area network
- WAN wireless wide area network
- PAN personal area network
- VPN virtual private network
- Sampling systems 100 and methods according to this disclosure may be embodied, in whole or in part, in computer program products or in computer systems 400 , such as that illustrated in FIG. 4 .
- the present invention may be a system, a method, and/or a computer program product.
- the computer program product may include a computer readable storage medium (or media) having computer readable program instructions thereon for causing a processor to carry out aspects of the present invention.
- the computer readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device.
- the computer readable storage medium may be, for example, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing.
- a non-exhaustive list of more specific examples of the computer readable storage medium includes the following: a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device such as punch-cards or raised structures in a groove having instructions recorded thereon, and any suitable combination of the foregoing.
- RAM random access memory
- ROM read-only memory
- EPROM or Flash memory erasable programmable read-only memory
- SRAM static random access memory
- CD-ROM compact disc read-only memory
- DVD digital versatile disk
- memory stick a floppy disk
- a mechanically encoded device such as punch-cards or raised structures in a groove having instructions recorded thereon
- a computer readable storage medium is not to be construed as being transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission media (e.g., light pulses passing through a fiber-optic cable), or electrical signals transmitted through a wire.
- Computer readable program instructions described herein can be downloaded to respective computing/processing devices from a computer readable storage medium or to an external computer or external storage device via a network, for example, the Internet, a local area network, a wide area network and/or a wireless network.
- the network may comprise copper transmission cables, optical transmission fibers, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers.
- a network adapter card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium within the respective computing/processing device.
- Computer readable program instructions for carrying out operations of the present invention may be assembler instructions, instruction-set-architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state-setting data, or either source code or object code written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like, and conventional procedural programming languages, such as the “C” programming language or similar programming languages.
- the computer readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server.
- the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).
- electronic circuitry including, for example, programmable logic circuitry, field-programmable gate arrays (FPGA), or programmable logic arrays (PLA) may execute the computer readable program instructions by utilizing state information of the computer readable program instructions to personalize the electronic circuitry, in order to perform aspects of the present invention.
- These computer readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
- These computer readable program instructions may also be stored in a computer readable storage medium that can direct a computer, a programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer readable storage medium having instructions stored therein comprises an article of manufacture including instructions which implement aspects of the function/act specified in the flowchart and/or block diagram block or blocks.
- the computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other device to produce a computer implemented process, such that the instructions which execute on the computer, other programmable apparatus, or other device implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
- each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s).
- the functions noted in the block may occur out of the order noted in the figures.
- two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
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